Monoazo dyestuff for chrome-mordanted wool.



whose 'POSt-Q ce addresses are, res ecti'vely,

= TiNITED STATES PATENT OFFICE.

twee esnotaausnn, or 'oaossmronrunrfimaosw, NEAR BERLIN,, AND namnzcn os'rnm'or custom-misuse 2, GERMANY, ASSIGTNORS To ACTIEN GESELLSGHAFT we mum mummies,- or BERLI'N', osmium.

MONOAZO DYE SIU 'IF FOR CIII BOME-MORDANTED WOOL.

Gross-Lie terfeldedDst near Berlin, and

Charlottenbur 2, near Berlin, Germany, and

Grabenstrasse 12, Gross-Lichter elde-Ost,

near Berlin, and Guerickest-rasse' 14, Char lottenburg 2, near Berlin, Germany, have invented certain new and useful Improvements in Monoazo l) estufi's for Ohrome-Mordanted. Wool, of w ich the following is a speclfication.

. L Our invention relates to the manufacture of a new monoazo dyestufi' for wool which is to be used in combination with a chromesol 'morda-nt; the new-coloringmatter produces eep an 1 in this Way, generally speaking, a full red shade-which possesses a go fastness and is more especially yery fast toiighth This new product is obtained by :diazotiein afle'iiyzttiv'eof diamin'o henol sulfon c acid of the =fol'lowing genera -formi1lar OH5NH NHICO. CH S0 H=1E2: 456 and combining the 'diaz'o compound thus ob tained with 1-phenyl 3inetl1yl-5-pyrazolone.

The following example may-Serve to illustrate the invention, the parts being by weight: parts of acetyldiaminophenolsul fomc acid (compare the'a'bove -=fo"r'm'u1a) are di'azotizcd in the usual manner in an aqueous solution b means of 30 parts of -hy r1 mo-- rid geido' QH B'aLum specific. ,avity and f? par-tsof sodium nitrite. (The: ia'z'o' olutron thus-obtained is allowed to run while stuf r I lng m the Shape of the. sodium; salt; 11 pulrin into an aqueous solut'ion' 'of118 p'artslof means of 14mm of caustic soda; lye of 40? anhyhmusscdium an innate. The combinw tion o'ccurs at once, most ofthe dyestufl se aratingywhen the reaction 1's-:fin1sh'edt'1e precipitation cf theprotluct is completed fth addition of common salt and thedgestuif 117. 0%

,at'ed" by drainin' ,press'i'ng and not c1 ulceriae Patented Jan. 31, 1911.

98%,132. Specification of Letters Patent. No Drawing. Application filed October 27, 1808. Serial No. 524,837.

To all whom 1' 1! may concern: t

to yellow, whereas adding concentrated h drochloric acid or lacial acetic acid 0 anges the color to ye low the free acid of the dyestuff beingseparated. In alcohol the new product is only diflicultly soluble; in-

. concentrated sulfuric acid it dissolves to a yellow solution which solution on the addition of ice separates the free acid of the dyestufi. The neutral aqueous solution of the product when boiled with zine-dust is decolorized', the solution assuming afterward a light yiolet color. This new-'dyestuif produoes on WOOl when dyed from an acid bath .and subsequently treated .with an oxidizing chromium compound a deep and full red shade of a 'ood fastness and more especially of a good astliess to light.

It is obvious tothose skilled in the art that the present invention is not limitedto th fforegoin d g example or to the details give. t r in-j Having now described our inyention and 1 the manner in which it may be performed,

what'we claim is;-

As a new article of manufacture the new monoazo d estuif which may be obtained -by diaz0tiz1ng acet-yl diaminophenolsulfonic and combining the diazo com ound thus obtained with 1-phenyl-3-methy -5 pyrazolone, which new product produces on wool from cod iastnessfto light, this new dyestu'fi, be

8 5 an. acid bath-in combination with a suitable, chrome-mordant a deep and full red shade of a'goo'c lfastness and more especially of a erized .a red brown powder dissolving in tion on the addition-of *concen'tratedsodailye or "of concentrated liquor ammonia'e' turns to: J

yellow, whereas adding coilcentrated hydrochloric acid or glacial acetic-acid changesthe color f/o yellow the free acid of the-dyes'tufi in only being se' aratei this new dyestufi'bc littlei-so uble alctiholfb t 'd orized, the soliition assumin1 afterward :1 our hands in presenco of two subscribing witlight violet color, whereas t e dyestufi' is Iiesses.

split up by the action of stannons chlorid v HUGO GELDERMANN. and hydrochloric acid on boilin yielding HEINRICH OSTER. diaminophenol sulfonic acid besi es ami 1o- \Vitnesses:

VVOLDEMAR 'I-IAUPT',

l-phenyl-3-n1ethyl-5-pyraz0l0ne.

HENRY HAsPER.

In testimony whereof We have hereunto set- 

